CTFd is a Capture The Flag framework designed for creating and managing cybersecurity competitions and training exercises. The platform provides an administrative interface for creating challenges across multiple categories, with support for various challenge types and difficulty levels. Users can configure hints, flags, and scoring mechanisms through the web-based management system. The framework supports both static and regex-based flag validation, along with custom flag plugins for specialized challenge requirements. Challenge creators can implement attempt limits and automatic bruteforce protection to maintain competition integrity. CTFd accommodates both individual and team-based competitions, featuring dynamic scoring systems that adjust point values based on solve rates. The platform includes unlockable challenges that become available based on prerequisite completions or team progress. The system provides comprehensive scoreboard functionality with automatic tie resolution and score graphs for tracking participant progress over time. Content management capabilities support Markdown formatting for challenge descriptions and documentation. Email integration is available through SMTP and Mailgun services for participant communications and notifications. Team management features allow for group formation, member administration, and collaborative competition participation. File upload capabilities enable challenge creators to distribute necessary materials, tools, or datasets to participants. The plugin architecture allows for extensibility and custom challenge types beyond the standard offerings.